You'll just have to learn to dodge the meteors that the baphos drop. It shouldn't be to hard.
If you have a sieg in your party, Mdef works really well at this part since it protects you from the bombs and the fires, so u can sit on the fires melee'ing them and you wont get hit.
Remember, the fires are weak to wind element skills (i.e Nados, whirling sword), and ice skills (i.e Yuki...). Use those to your advantage so you can kill the fires fast.